052
FNCA52 TJSJ 210730
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
330 AM AST SUN JUN 21 2026
DISCUSSION
A TROPICAL WAVE WILL BRING BENEFICIAL RAINS ACROSS PORTIONS OF
THE ISLANDS TODAY. WINDS WILL PREVAIL MAINLY FROM THE EAST TO
EAST- SOUTHEAST AT 10 TO 20 MPH, WITH GUSTS UP TO 33 MPH,
ESPECIALLY FROM MID MORNING INTO THE AFTERNOON. THE TROPICAL WAVE
WILL MAINTAIN RH VALUES ABOVE CRITICAL LEVELS.
PRZ014-212000-
SOUTHEAST COASTAL PLAINS-
330 AM AST SUN JUN 21 2026
TODAY TONIGHT MON
CLOUD COVER PCLDY PCLDY MCLEAR
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 30 10
TEMP (24H TREND) 91 (0) 74 (-2) 93
RH % (24H TREND) 49 (+1) 90 (+5) 46
WIND 20FT/EARLY(MPH) E 17 E 17 E 18
WIND 20FT/LATE(MPH) E 19 E 13 E 18
MIXING HGT(FT-AGL/MSL)5250 5060
TRANSPORT WND (MPH) E 21 E 23
VENT RATE (KT-FT) 94500 101200
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-212000-
SOUTHERN HILLS-
330 AM AST SUN JUN 21 2026
TODAY TONIGHT MON
CLOUD COVER PCLDY PCLDY MCLEAR
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 20 10
TEMP (24H TREND) 87 (+1) 70 (-4) 89
RH % (24H TREND) 62 (+3) 98 (+10) 55
WIND 20FT/EARLY(MPH) E 13 E 13 E 14
WIND 20FT/LATE(MPH) E 14 E 13 E 14
MIXING HGT(FT-AGL/MSL)5710 5360
TRANSPORT WND (MPH) E 20 E 22
VENT RATE (KT-FT) 97070 101840
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-212000-
NORTH COASTAL PLAINS-
330 AM AST SUN JUN 21 2026
TODAY TONIGHT MON
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 20 10
TEMP (24H TREND) 90 (0) 73 (-3) 91
RH % (24H TREND) 62 (+1) 98 (+10) 58
WIND 20FT/EARLY(MPH) E 16 E 17 E 18
WIND 20FT/LATE(MPH) E 21 E 13 E 23
MIXING HGT(FT-AGL/MSL)5140 5500
TRANSPORT WND (MPH) E 21 E 22
VENT RATE (KT-FT) 92520 104500
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-212000-
NORTHERN HILLS-
330 AM AST SUN JUN 21 2026
TODAY TONIGHT MON
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 60 10 30
TEMP (24H TREND) 89 (0) 71 (-2) 90
RH % (24H TREND) 64 (+4) 99 (+9) 58
WIND 20FT/EARLY(MPH) E 14 E 14 E 17
WIND 20FT/LATE(MPH) E 19 E 11 E 20
MIXING HGT(FT-AGL/MSL)6390 6470
TRANSPORT WND (MPH) E 16 E 17
VENT RATE (KT-FT) 89460 97050
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-212000-
WEST COAST-
330 AM AST SUN JUN 21 2026
TODAY TONIGHT MON
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 70 10 50
TEMP (24H TREND) 92 (0) 73 (-2) 93
RH % (24H TREND) 60 (0) 96 (+8) 56
WIND 20FT/EARLY(MPH) E 14 E 17 E 17
WIND 20FT/LATE(MPH) E 16 E 12 E 17
MIXING HGT(FT-AGL/MSL)4540 4880
TRANSPORT WND (MPH) E 12 E 16
VENT RATE (KT-FT) 45400 68320
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-212000-
EASTERN INTERIOR-
330 AM AST SUN JUN 21 2026
TODAY TONIGHT MON
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 40 40
TEMP (24H TREND) 88 (+1) 71 (-4) 89
RH % (24H TREND) 64 (+4) 98 (+7) 60
WIND 20FT/EARLY(MPH) E 14 E 16 E 16
WIND 20FT/LATE(MPH) E 16 E 14 E 16
MIXING HGT(FT-AGL/MSL)6140 5480
TRANSPORT WND (MPH) E 20 E 22
VENT RATE (KT-FT) 104380 104120
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-212000-
LUQUILLO MOUNTAIN RANGE-
330 AM AST SUN JUN 21 2026
TODAY TONIGHT MON
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 50 40
TEMP (24H TREND) 83 (+2) 70 (-3) 85
RH % (24H TREND) 71 (+2) 100 (+5) 66
WIND 20FT/EARLY(MPH) E 12 E 13 E 14
WIND 20FT/LATE(MPH) E 13 E 12 E 14
MIXING HGT(FT-AGL/MSL)4540 4900
TRANSPORT WND (MPH) E 21 E 22
VENT RATE (KT-FT) 81720 93100
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-212000-
CENTRAL MOUNTAIN RANGE-
330 AM AST SUN JUN 21 2026
TODAY TONIGHT MON
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 60 10 50
TEMP (24H TREND) 88 (+4) 68 (-3) 90
RH % (24H TREND) 65 (+3) 98 (+8) 58
WIND 20FT/EARLY(MPH) E 10 E 10 E 12
WIND 20FT/LATE(MPH) E 12 E 9 E 12
MIXING HGT(FT-AGL/MSL)7290 7160
TRANSPORT WND (MPH) E 14 SE 13
VENT RATE (KT-FT) 87480 78760
DISPERSION 5 5
DSI 5 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-212000-
CAYEY MOUNTAIN RANGE-
330 AM AST SUN JUN 21 2026
TODAY TONIGHT MON
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 40 40
TEMP (24H TREND) 83 (0) 70 (-3) 84
RH % (24H TREND) 71 (+7) 100 (+5) 65
WIND 20FT/EARLY(MPH) E 11 E 12 E 14
WIND 20FT/LATE(MPH) E 13 E 12 E 13
MIXING HGT(FT-AGL/MSL)5250 5020
TRANSPORT WND (MPH) E 21 E 22
VENT RATE (KT-FT) 94500 95380
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-212000-
VIEQUES-
330 AM AST SUN JUN 21 2026
TODAY TONIGHT MON
CLOUD COVER PCLDY PCLDY MCLEAR
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 30 20
TEMP (24H TREND) 89 (+2) 76 (-2) 89
RH % (24H TREND) 61 (-1) 91 (+2) 60
WIND 20FT/EARLY(MPH) E 18 E 18 E 19
WIND 20FT/LATE(MPH) E 18 E 19 E 18
MIXING HGT(FT-AGL/MSL)3400 3520
TRANSPORT WND (MPH) E 23 E 23
VENT RATE (KT-FT) 68000 70400
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-212000-
CULEBRA-
330 AM AST SUN JUN 21 2026
TODAY TONIGHT MON
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 20 20
TEMP (24H TREND) 90 (+2) 77 (-1) 91
RH % (24H TREND) 59 (-4) 92 (+1) 58
WIND 20FT/EARLY(MPH) E 18 E 18 E 19
WIND 20FT/LATE(MPH) E 18 E 19 E 18
MIXING HGT(FT-AGL/MSL)3400 3440
TRANSPORT WND (MPH) E 23 E 23
VENT RATE (KT-FT) 68000 68800
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-212000-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
330 AM AST SUN JUN 21 2026
TODAY TONIGHT MON
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 30 0 10
TEMP (24H TREND) 93 (+2) 75 (-2) 93
RH % (24H TREND) 49 (-2) 87 (+7) 44
WIND 20FT/EARLY(MPH) E 19 E 23 E 24
WIND 20FT/LATE(MPH) E 21 E 19 SE 24
MIXING HGT(FT-AGL/MSL)4820 5050
TRANSPORT WND (MPH) E 22 E 25
VENT RATE (KT-FT) 91580 111100
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-212000-
SAINT THOMAS AND SAINT JOHN-
330 AM AST SUN JUN 21 2026
TODAY TONIGHT MON
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE TSTMS NONE SHOWERS
CHANCE PRECIP (%) 60 0 10
TEMP (24H TREND) 87 (+1) 77 (0) 87
RH % (24H TREND) 65 (0) 91 (-3) 64
WIND 20FT/EARLY(MPH) E 18 E 18 E 19
WIND 20FT/LATE(MPH) E 18 E 19 E 18
MIXING HGT(FT-AGL/MSL)3350 3480
TRANSPORT WND (MPH) E 23 E 26
VENT RATE (KT-FT) 67000 80040
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-212000-
ST CROIX-
330 AM AST SUN JUN 21 2026
TODAY TONIGHT MON
CLOUD COVER PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 30 10
TEMP (24H TREND) 88 (+1) 77 (-2) 88
RH % (24H TREND) 64 (-1) 92 (+5) 62
WIND 20FT/EARLY(MPH) E 18 E 17 E 19
WIND 20FT/LATE(MPH) E 18 E 19 E 19
MIXING HGT(FT-AGL/MSL)4640 4530
TRANSPORT WND (MPH) E 25 E 28
VENT RATE (KT-FT) 102080 108720
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
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